Question

how to use “where” keyword to add constraints to a generic class in CLI/C++? I’ve been searching for a while – but even msdn has only C# documentation!

So the first part of the question is: where to put “where” and what can be written next to it when defining generic classes?

   generic <class T> ref class Stack   
   {
      //........
   }

Second part of the question is: what does where T:IComparable mean in the function definition below?

   generic <typename T> where T:IComparable
   T Function(array <T>^ x)
   {
      T max(x[0]);
      for(int i = 1; i < x->Length; i++)
      if(max-> CompareTo(x[i]) < 0)
      max = x[i];
      return max;
   }

Answer 1

1. In your example, where goes between generic <class T> and ref class Stack.

2. From the C++/CLI documentation:

   where type-parameter: constraint list
   

   constraint list is a comma-separated list of constraint specifications. The list can include interfaces to be implemented by the type parameter.